What element is shared by both Chrissie Magyar and Thomas edison's inventions? They use electricity. Both inventors created their devices in research laboratories. Their devices have been listed with the U. S. Patent office. They use audio, or sound, for entertainment purposes.​

The constant presence of diseases or infectious agents within a given geographic area or population group. it may also refer to the usual prevalence of a given disease with such area or group. it includes holoendemic and hyperendemic diseases. a holoendemic disease is one for which a high prevalent level of infection begins early in life and affects most of the child population, leading to a state of equilibrium such that the adult population shows evidence of the disease much less commonly than do children (malaria in many communities is a holoendemic disease). a hyperendemic disease is one that is constantly present at a high incidence and/or prevalence rate and affects all groups equally. so probably family history.

They would be more crops at 1a and 1b more than 1c